Just to check maid off days is from what time to what time?

I don't understand why this concept it so difficult to grasp. It's the whole day!! Ie, she finishes work at the agreed time the night before, and she starts again the following day at the usual time. If you work at an office, weekdays 9-5, do you consider yourself "working" at 8 am on a Saturday?! How about 6pm on Sunday?